mirror of
https://github.com/AsahiLinux/u-boot
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134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2007 Michal Simek
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* (C) Copyright 2004 Atmark Techno, Inc.
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*
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* Michal SIMEK <monstr@monstr.eu>
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* Yasushi SHOJI <yashi@atmark-techno.com>
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*/
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#include <common.h>
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#include <bootstage.h>
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#include <command.h>
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#include <cpu_func.h>
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#include <env.h>
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#include <fdt_support.h>
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#include <hang.h>
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#include <image.h>
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#include <lmb.h>
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#include <log.h>
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#include <asm/cache.h>
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#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
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DECLARE_GLOBAL_DATA_PTR;
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static ulong get_sp(void)
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{
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ulong ret;
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asm("addik %0, r1, 0" : "=r"(ret) : );
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return ret;
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}
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void arch_lmb_reserve(struct lmb *lmb)
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{
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ulong sp, bank_end;
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int bank;
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/*
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* Booting a (Linux) kernel image
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*
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* Allocate space for command line and board info - the
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* address should be as high as possible within the reach of
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* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
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* memory, which means far enough below the current stack
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* pointer.
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*/
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sp = get_sp();
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debug("## Current stack ends at 0x%08lx ", sp);
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/* adjust sp by 4K to be safe */
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sp -= 4096;
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for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
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if (sp < gd->bd->bi_dram[bank].start)
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continue;
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bank_end = gd->bd->bi_dram[bank].start +
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gd->bd->bi_dram[bank].size;
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if (sp >= bank_end)
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continue;
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lmb_reserve(lmb, sp, bank_end - sp);
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break;
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}
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}
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static void boot_jump_linux(bootm_headers_t *images, int flag)
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{
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void (*thekernel)(char *cmdline, ulong rd, ulong dt);
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ulong dt = (ulong)images->ft_addr;
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ulong rd_start = images->initrd_start;
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ulong cmdline = images->cmdline_start;
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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thekernel = (void (*)(char *, ulong, ulong))images->ep;
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debug("## Transferring control to Linux (at address 0x%08lx) ",
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(ulong)thekernel);
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debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
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cmdline, rd_start, dt);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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printf("\nStarting kernel ...%s\n\n", fake ?
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"(fake run for tracing)" : "");
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bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
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#ifdef XILINX_USE_DCACHE
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flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
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#endif
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if (!fake) {
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/*
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* Linux Kernel Parameters (passing device tree):
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* r5: pointer to command line
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* r6: pointer to ramdisk
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* r7: pointer to the fdt, followed by the board info data
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*/
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thekernel((char *)cmdline, rd_start, dt);
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/* does not return */
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}
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}
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static void boot_prep_linux(bootm_headers_t *images)
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{
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
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debug("using: FDT\n");
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if (image_setup_linux(images)) {
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printf("FDT creation failed! hanging...");
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hang();
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}
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}
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}
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int do_bootm_linux(int flag, int argc, char *const argv[],
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bootm_headers_t *images)
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{
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images->cmdline_start = (ulong)env_get("bootargs");
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/* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
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if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
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return -1;
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if (flag & BOOTM_STATE_OS_PREP) {
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boot_prep_linux(images);
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return 0;
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}
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if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
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boot_jump_linux(images, flag);
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return 0;
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}
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boot_prep_linux(images);
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boot_jump_linux(images, flag);
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return 1;
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}
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